Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 131 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.True or false: a rough doormat gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a grippy rubber sole
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) sand on a slippery path (d) chalk on a gym bar
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
8. 8.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
10. 10.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
11. 11.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
13. 13.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a wheel on ball bearings (d) a grippy rubber sole
15. 15.True or false: a tyre with deep treads gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
17. 17.True or false: a box pushed on carpet gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wet tiled floor (d) chalk on a gym bar
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
21. 21.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
22. 22.True or false: a wet tiled floor gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
24. 24.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
27. 27.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
28. 28.True or false: chalk on a gym bar gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a smooth steel slide (d) a wheel on ball bearings
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 6 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) skating on ice (d) chalk on a gym bar
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
39. 39.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet

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